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English definition of “sell (sb) out”

sell (sb) out

informal
verb uk phrasal verb with sell   /sel/ (sold, sold) us  
to not do what you have promised someone you will do or what you should do because you will get more advantages for yourself if you do something else: French farmers feel they've been sold out by their government in the negotiations. They've sold out to the road transport lobby (= done what these people wanted).Disappointing yourself and others
(Definition of sell (sb) out from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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